SCCM 2012 R2 can't enable option to upgrade client

Our SCCM system was set up by some guys from CDW. When they left their accounts were disabled and then 90 days later deleted as per company policy. Now I find that the "Upgrade client automatically when new client updates are available" option wasn't enabled. And I can't seem to enable it because it's grayed out.

If I don't have access to the account that did the install is there anyway I can enable this feature? Or is there some way I can manually update them all with out having to run the installer on each machine individually?

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